Grinding Unit Cooling Device With Support Projections
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Solution Overview
Problem
Vibratory mills face challenges in achieving uniform and fine particle sizes due to adhesions and temperature-related shape and position deviations, which affect the grinding process and lead to contamination and geometric distortions, making it difficult to produce small grinding stock particles with consistent sizes.
Innovation Solution
The introduction of a supporting projection for the grinding wall between cooling channels, which provides external support and maintains a consistent cooling effect, along with a housing ring that is thermally shrunk onto the grinding wall, helps in preventing warpage and ensuring uniform cooling, while also allowing for effective cleaning with compressed air to remove residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling channels are introduced adjacent to the grinding wall, then temperature control is improved, but the grinding wall may still warp due to thermal expansion
Solution Approach 1:
The patent applies local quality by introducing a supporting projection specifically at the location where thermal warpage occurs most severely - between the cooling channels on the outer surface of the grinding wall. This localized support structure provides targeted counteraction to thermal expansion forces without requiring complete redesign of the entire cooling system or grinding wall structure.
Solution Approach 2:
The supporting projection embodies preliminary anti-action by being positioned in advance to counteract thermal warpage before it fully develops. The projection engages with the grinding wall in a region prone to thermal expansion, providing preemptive mechanical restraint that prevents the wall from bulging outward during operation, thereby maintaining the required parallelism of the grinding gap.
2Strength
If the grinding wall is made of hard and abrasion-resistant material, then grinding performance is improved, but the wall becomes more sensitive to notches and defects
Solution Approach 1:
The patent applies preliminary action by performing thermal shrinking of the housing ring onto the grinding wall before assembly. This pre-stress treatment creates a compressive residual stress field in the grinding wall that compensates for the brittleness and notch sensitivity of hard materials, effectively strengthening the wall against defect propagation during subsequent operation.
Solution Approach 2:
The patent employs composite material principles by combining the hard, abrasion-resistant grinding wall material with a ductile housing ring material that undergoes thermal shrinking. This composite construction allows the grinding wall to maintain its hardness for cutting performance while the ductile housing provides toughness and resistance to notch effects, creating a synergistic combination that overcomes the limitations of using hard materials alone.
3Stability of the object's composition
If cooling channels are spaced closely together, then cooling uniformity is improved, but structural complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the cooling system into discrete cooling channels spaced at regular intervals around the grinding wall, with supporting projections positioned between these channels. This segmented approach achieves uniform cooling distribution through multiple localized cooling zones while maintaining manageable structural complexity through the repetitive, modular pattern of channels and supports.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the fineness and uniformity of ground particles, reduces adhesions, and maintains the parallelism of the grinding gap, leading to improved particle size consistency and reduced contamination risks, allowing for efficient and precise grinding operations.
Implementation Method 1
a cooling device (38) for cooling the grinding wall (4)
Implementation Method 2
the housing ring (11) is thermally shrunk onto the grinding wall (4)
Data Source
Figure 1
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AI summary
The invention relates to a grinding unit (2) for a vibration mill (1), particularly a disk vibration mill, wherein a milling chamber (3) is configured in the grinding unit (2), the chamber being delimited on the side by a grinding wall (4) and comprising a cooling device (38) surrounding the wall. In order to achieve a practical improvement, the cooling device (38) comprises two or more cooling channels (39) abutting the grinding wall (4) from the outside and disposed circumferentially along at least one common circumferential section of the grinding wall (4), wherein adjacent cooling channels (39) are spaced from each other at least circumferentially in section by a circumferentially extending support projection (41). The support projection (41) supports the grinding wall (4) against a housing (11) surrounding it from the outside. The invention further relates to a vibration mill (1), particularly a disk vibration mill, having said grinding unit incorporated.